Drill-bit.



W. E. USREY.

DRILL BIT.

APPLICATION FILED MAR. 2, I918.

Patented Dec. 9, 1919.

FII3 E ambem co'c WILFRED E. USREY, 0F BINGHAM CANYON, UTAH.

DRILL-BIT.

Application filed March 2, 1918.

trated is especially adapted for use as a' rock drill although it may be used for other purposes.

By reason of the construction hereinafter described, the improved bit is rendered far more durable than the ordinary bit now in common use, it being almost impossible to break or fracture the bit by reason of the disposition of the cutting faces or edges thereof. 7

It is a further object of the invention to produce a bit which will remain sharp for a long period of time and which may be easily re-sharpened when necessary.

It is a further object of the invention to produce a bit having an active face which is square in plan and which face is inclined or beveled from its sides and ends to the center thereof, the apex and corners of the beveled portions each presenting a separate cutting edge, the beveled surfaces presenting pulverizing faces and the sides presenting cutting surfaces whereby the rock or ore acted on during the cutting operation will be both out and pulverized so that the bit can perform its work with great rapidity and accuracy.

I lVith the above and other objects in view, the invention consists in the novel construction, combination and arrangement of parts as herein described, illustrated and claimed.

In the accompanying drawings, I

Figure 1 is a perspective view of the improved bit.

Specification of Letters Patent.

Salt

Patented Dec. 9, 1919.

Serial No. 220,004.

Fig. 2 is a view looking toward the working face of the bit.

The improved bit comprises the usual shank l which may be of any desired diameter and length according to the use to which it is to be put. The working end of the bit is enlarged as shown, to provide a head 2 which is substantially square or rectangular, comprising The working face of the bit comprises a central cutting edge l of any suitable length, preferably of the same length as the diameter of the shank 1, and other cutting edges 5 which extend from the oppositeextremities of the cutting'edge i to the corners of the head of the bit. Thus five cutting edges are provided as clearly shown in ig. 2, said cutting edges being approximately equal in length. By such formation and arrangement of the cutting edge 4: and 5, inclined crushing or pulverizing faces 6 and 7 being formed, there being four of such inclined faces','-the faces 7 being hitched at -'greater, angles than the faces 6. By reason of the faces-6 and 7 the bit operates to pulverize the rock or ore simultaneously with the cutting operation.

I claim:

the four sides or edges3.

A rock drilling bit comprising a shank of its ends and straight which is flared outwardly at one to provide four angular walls edges at the ends of the walls, said bit, from the said straight edges being extended outwardly and the said extensions being beveled inwardly to provide a sharpened edge which is of a length approximately equaling the cross sectional diameter of the shank so that two of the diametrically opposed beveled walls are of a greater angular pitch than the remaining two beveled sides.

In testimony whereof I affix my signature.

WQILFRED E. .USREY. 

